How to get a tax file number in Australia

There are four separate application channels, and using the wrong one is the most common reason an application stalls. The ATO routes you by your citizenship or visa status, not by where you are standing.

Pick the route that matches your situation before you start filling anything in.

Whichever route you use, the application will stop and ask for identity evidence. Having it ready turns a twenty-minute job into a five-minute one.

The ATO uses a document-category system rather than a points system: you generally need one primary document and one or two secondary ones. Your name must match across all of them, and a mismatch — a married name on one document and a maiden name on another — is the second most common cause of delay after using the wrong channel.

This is the fastest path by a wide margin. Set up a Digital ID (the government's identity app, formerly myGovID) and verify it to at least Standard identity strength using your Australian passport plus one other document. Then sign in to myGov, link the ATO, and apply for the TFN through the ATO's online services.

Because the identity check has already been done by the Digital ID system, the ATO can often issue the number on the spot rather than posting it. If the system cannot match you automatically, it falls back to the standard 28-day process.

If you are a permanent migrant, or a temporary visitor with work rights — a working holidaymaker, student, skilled temporary visa holder, or New Zealand citizen who has entered on a Special Category visa — you apply through the ATO's online individual auto-registration form.

You must already be in Australia to apply through this route, and your visa must already be in effect. The form checks your passport details directly against Department of Home Affairs records, which is why the passport number has to be entered exactly as it appears on the visa grant notice, including any letters.

New Zealand citizens are a useful special case: entering Australia on a Special Category visa is enough, and no separate visa application is needed before applying for the TFN.

Australian residents without an Australian passport complete the ATO's paper application and then present their original identity documents in person — at a participating Australia Post outlet if you are applying through that channel, or at a Services Australia service centre if you are already a Centrelink customer.

You must attend within 30 days of completing the online part, and you must bring originals. Copies, photographs and certified copies are not accepted for this step.

You can start work before your TFN arrives. On your first day, your employer will give you a Tax file number declaration — usually now completed digitally through ATO online services rather than on paper. Tick the box indicating you have applied for a TFN but not yet received it.

That declaration buys you 28 days at normal withholding rates. If the number has not arrived by then, the employer is legally required to start withholding at the top marginal rate plus the Medicare levy — currently 47 per cent — until you supply it. You get the overpayment back when you lodge your tax return, but living on 53 per cent of your pay in the meantime is unpleasant.

Your super fund needs the number too. Without it, a fund cannot accept most personal contributions and taxes employer contributions at a higher rate, so give it to your fund as soon as it arrives.

Your TFN is a permanent identifier that cannot be changed if it is misused, which makes it a prime target for identity crime. Treat it like a passport number, not like an email address.

Give it only to your employer (after you start, never during an application), your super fund, your bank, your registered tax agent, Services Australia and the ATO. Nobody else has a legitimate reason to demand it. A prospective employer asking for it before an offer is a warning sign.

The ATO does not call to threaten arrest, does not ask for payment in gift cards or cryptocurrency, and does not demand your TFN over social media or a messaging app. If a message claims to be from the ATO and creates urgency, hang up and call 13 28 61 yourself.

You never need to apply for a second one, and applying twice creates duplicate records that take longer to untangle than simply finding the original.

Look first in ATO online services through myGov, where the number is displayed under your profile. Failing that, it appears on any past notice of assessment, on a payment summary or income statement, on a superannuation member statement, or in the records of any registered tax agent who has acted for you. If none of those work, phone the ATO on 13 28 61 and answer the identity questions.